The Preparation Of Titanium Modified Silica Gel And Their Supported Zirconium Catalysts Catalyzed The Polymerization Of Olefins

In this thesis, on the basis of existing technology for modification of silica gel carrier, mainly modification of titanium silica gel carrier. The addition of titanium compounds studied methods and flow rate, pH, aging time and drying conditions of choice. Experiments show that:in the early days 6ml/min rate of sol-gel titanium compound added, the solution pH value reached in 11 stop, the old time control in 5hr, with 200℃(1hr)-400℃(1hr)-600℃(2hr) and 200℃(2hr)-600℃(4hr) gradient secondary activation of the drying process, better performance can be modified silicone carrier products.955 were imported silica gel metallocene load studies have shown that the first response to activated MAO pretreated silica carrier, in-30℃to join the main catalyst under the conditions of 1-methyl-3℃butyl isoprene-based zirconium dichloride and the MAO solution, the reaction process control the amount of catalyst contained 17% Al containing Zr is 0.5%, to 5,000 times more activity in the preparation of the metallocene catalyst. Used to determine the process conditions, silicon and titanium-containing catalysts supported on silica gel 955 aggregated evaluation, and metallocene catalyst activity and polymer properties were compared. Ti-silica supported metallocene catalyst in the active area and 955 silica-supported metallocene catalyst is a gap, but the titanium catalyst supported on silica gel by molecular weight distribution of polymer catalysts supported on silica gel than 955 have broad molecular weight distribution of polymer and the phase transition temperature of the two polymers are basically the same.